Sylvania



uitrit y tetes strat @fitta V4WILLIAM A. MORSE AND JOHN G.' POWELL, OFPHILADELPHIA, PENN- SYLVAN-IA.

'Letters Patent No. 78,887, @lated June 16, 1868.

IMPROVEMENT 1N Emst-sns.

dige tlgtttle referat tu in there ,letters ztteut mit making ,parteitige same.

To ALL WHoM 'IT MAY lconcern:

Be it known that we, WILLIAM A. Mense and JoHN G. POWELL, both of thecity and county of Philadelphia, and State of Pennsylvania, haveinvented u. new and useful Improvement in Ink-Erasers; and ive do herebydeclareV that the following is a full and exact description of theconstruction and operation of thesnme.

The nature of our invention consistsin vmakinggpa. knife from thin sheetsteel, of any desired size or form, far. a'spcciic work, and stiffen thesame by corrugation. Y

To enable others skilled in the art tomake and-use our invention, wewill proceed to describe its coustruction and operation. i p l We makeour.improved eraser, shown Yin the annexed drawing, of thin `sheetsteel. We generally select common steel plate, ofabout twenty-fourgauge,`cut the same into strips of'suitable widths, and anneal them in afurnace, after which theyare rolled cold-to the desiredthi'nness,`between rollers adapt-ed to such vwork. We then cut thesestrips in a press, with die and punch of desired sie and form, afterivhich'we anneal the blanks .by subjecting them to suitableheat in afurnace; then they are ready for conjugating, which we do with a die and'punch in a drop-press. We do not specify any particular number ofcorrugations to be produced on the blade of our eraser, but we find thatfour will produce a much stiffer' and better blade than two. The lighterwe make the steel, the more oorrugations we make in the blade. Y l

` The edges o o ofthe eraser Hare struck or turned up in the operationof forming the corrugations 020112, and left projecting above thecorrugated surface far enough to admit ofY grinding both of said edgeson a fiat stone at the same time, without interfering or grinding saidcorrgations to inar the surfaceaofthe same.

The advantage of using cold rolled steel is to lessen the expense in thework of polishing, which enables us to do it by tumbling" the blades,after hardening, in metallic cylinders, containing emery or othermineral,

and may be done in lots of one-hundred gross at atime, therebyproducinga very smooth and highly-polished i snrfaceat a very triingcost.

We can manufacture our improved eraser-blade all conplet'e for a handle,at an expense not exceeding` forty cents a. gross, and in many respectsit is superior-to erasers nowin common use, which retail at from fiftycents to one'dollar each, being much lighter, andirnore easily sharpenedwhen dull. i

The operation of using our improved eraser is substantially the same aserasers now in common use.

Having thus fully described our invention, what we claim as new, anddesire to secure'by Letters Patent, is-

An eraser-blade made from thin sheet steel, when the same is stiiienedby corrugations as shown and i described, for the purpose set forth.

WM. A. MORSE, JOHN G; POWELL.

Witnesses:

Leurs WAGNER, JAS. D. WELSH.

